Whirlpool bathtub



FIG. 1 is a top perspective view of a whirlpool bathtub showing my new design;

FIG. 2 is a cross section taken on line 2--2 of FIG. 3; and

FIG. 3 is a top plan view of the whirlpool bathtub of FIG. 1. 

The ornamental design for a whirlpool bathtub, as shown. 